Pygmy dipole strength in 86Kr and systematics of N=50 isotones


Journal Article

The dipole strength of the N=50 nucleus 86Kr was studied in photon-scattering experiments using bremsstrahlung produced with electron beams of energies of 7.9 and 11.2 MeV delivered by the linear accelerator ELBE as well as using quasimonoenergetic and linearly polarized γ rays of 10 energies within the range from 4.7 to 9.3 MeV delivered by the HIγS facility. A high-pressure gas target was used. We identified 39 levels up to an excitation energy of 10.1 MeV. Simulations of γ-ray cascades were performed to estimate intensities of inelastic transitions and to correct the intensities of the ground-state transitions for their branching ratios. The photoabsorption cross section derived in this way up to the neutron-separation energy is combined with the photoabsorption cross section obtained from a (γ,n) experiment at HIγS. The enhanced E1 strength found in the range from 6 to 10 MeV is compared with the ones in the N = 50 isotones 88Sr, 90Zr, and 92Mo and with predictions of calculations within the quasiparticle-phonon model. © 2013 American Physical Society.

Full Text

Duke Authors

Cited Authors

  • Schwengner, R; Massarczyk, R; Rusev, G; Tsoneva, N; Bemmerer, D; Beyer, R; Hannaske, R; Junghans, AR; Kelley, JH; Kwan, E; Lenske, H; Marta, M; Raut, R; Schilling, KD; Tonchev, A; Tornow, W; Wagner, A

Published Date

  • February 8, 2013

Published In

Volume / Issue

  • 87 / 2

Electronic International Standard Serial Number (EISSN)

  • 1089-490X

International Standard Serial Number (ISSN)

  • 0556-2813

Digital Object Identifier (DOI)

  • 10.1103/PhysRevC.87.024306

Citation Source

  • Scopus